The previous client version of Windows and successor to Windows Vista. Introduced in 2009, Windows 7 was superseded by Windows 8 in 2012 and Windows 10 in 2015. Although Microsoft offered Windows 7 users a free upgrade to 10 for an entire year, many people retained Windows 7 because they feel it is a solid operating system, and support is expected until January 2020. See Windows 7 versions, Windows 8 and Windows 10. Enhancements to the User Interface Multitouch capability was added, but compatible touchscreens are required to take advantage of the feature. Windows 7 introduced the "Superbar," a taskbar somewhat like the Dock in the Mac. The Superbar is used to show open applications as well as launch new ones, and icons can be rearranged, whereas they were fixed in previous versions. Jump Lists and Snap Placement Jump Lists provide a "most recent file" capability. When an application is open, right clicking its icon in the Superbar displays a list of the last files worked on. Developers can also add Jump Lists to their apps to display commonly used functions. Another improvement was quick window placement. Application windows snap to the top and sides of the screen by just moving them to the edges. Library Metafolders Folders and files can be grouped together in a high-level "Library" structure and indexed for fast searches (see Windows Libraries).